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Already answered the same thing (when 3.0.19 was what client 3.0.18.2 is now):

Originally Posted by dante696

Please do not forget the old client 3.0.18 did not check image files properly.
This has changed and had to be changed in client 3.0.18.1 (and newer) to avoid evil exploits!
If pictures now fail to show, then there is something wrong in the header file of the image. QT reject to show these iamges then.

Originally Posted by dante696

Our new Check for images did reject your picture, because there is something wrong in the header file.
The old client did not check everything in that image and did not reject the image. But that was bad and a security risk ;/

Which program was used to create that image?
I think many users will get the same problem now, but there is nothing we can fix.

Your action is required to solve that:
Re-create or save the picture with the same (could cause same problem again) or with other software.

Any program can cause problems with images (also Photoshop).
Check your client log first and then check your image file (we can not because we have no example from you).

//Edit
All clients now must reload any remote image once again to show it in the client.
The old cached file will not work anymore.

If you have problems, then check your client log first and server connection first.

When sending me private messages: Please make sure to include reference link to your forum thread or post.

Autoupdating from 3.0.16

Hi,

This is probably a silly question, but just for sanity of mind - I've not used teamspeak in a few months (coming form version 3.0.16) but I'm looking to update it for the obvious security reasons. Since I'm not quite aware of the attack vector being fixed here I just wanted to confirm.

If updating via the inbuilt auto-updater there's no chance of getting infected as long as I just go straight to auto-updating and do not connect to any servers, correct? (i.e. there's no inbuilt system of automatically retrieving public server details that could cause infection.)

Already answered the same thing (when 3.0.19 was what client 3.0.18.2 is now):

Any program can cause problems with images (also Photoshop).
Check your client log first and then check your image file (we can not because we have no example from you).

//Edit
All clients now must reload any remote image once again to show it in the client.
The old cached file will not work anymore.

If you have problems, then check your client log first and server connection first.

Sorry to bring this up again, but I cannot get any image to show up on my server. I've tried creating png and jpg images with multiple softwares (Windows Default Paint, paint.net, IrfanView, etc.), and I've tried uploading them to multiple picture hosts (imgur, vgy.me, someimage, etc.) and it simply will not display anything. I've tried many different pictures, new and old, and I've cleared my TS3 Client cache as I believe was instructed here. I've not tried doing anything server side, though, because I can't find anything that would be relevant there. The TS3 client log just says:
10/31/2015 17:51:39 Info Failed to read image C:/Users/Farfie/AppData/Roaming/TS3Client/cache/remote/Fyznc6J3lGeSZqNAX4hDOwrqZJMuSCV04tRloP35vUKvHDDnXb BY2uB7SxPhtTiAddPTwW5T1MK+3E+TCAoOFg==
10/31/2015 17:51:39 Info No image, refusing to display

And that's it. Sorry if I'm stupid, but is there something I'm not getting here?

Sorry to bring this up again, but I cannot get any image to show up on my server. I've tried creating png and jpg images with multiple softwares (Windows Default Paint, paint.net, IrfanView, etc.), and I've tried uploading them to multiple picture hosts (imgur, vgy.me, someimage, etc.) and it simply will not display anything. I've tried many different pictures, new and old, and I've cleared my TS3 Client cache as I believe was instructed here. I've not tried doing anything server side, though, because I can't find anything that would be relevant there. The TS3 client log just says:
10/31/2015 17:51:39 Info Failed to read image C:/Users/Farfie/AppData/Roaming/TS3Client/cache/remote/Fyznc6J3lGeSZqNAX4hDOwrqZJMuSCV04tRloP35vUKvHDDnXb BY2uB7SxPhtTiAddPTwW5T1MK+3E+TCAoOFg==
10/31/2015 17:51:39 Info No image, refusing to display

And that's it. Sorry if I'm stupid, but is there something I'm not getting here?

Thank you.

The client can not validate that your file is really a picture.
The header of the file is broken or the program that saved it does use non standard here to create image files.

The only fix here is to use another program to create your image file.